Creep-Free BearingsTM
Transcrição
Creep-Free Bearings TM A new bearing series that is indispensable for drive units in equipment such as motors for general use. Prevents creep when used with rotating loads, plus offers a reusable housing and easy assembling. New! The O-rings significantly help to prevent the occurrence of creep when fitted with loose housing tolerances. Also, since boundary dimensions are identical to standard bearings, the housing does not need to be reworked when replacing the bearing, contributing to reduced costs. 3.Creep-Free Bearings Table 1 Creep-Free Bearings List Bearing bore diameter Bearing outer diameter Bearing width d D B mm mm mm 1.Structure and performance of Creep-Free Bearings Creep resistance, N Creep-Free Bearings, which come with two O-rings mounted in the outer ring, help to prevent the occurrence of creep by restricting the amount of clearance between the outer ring and housing. No special machining is required; bearings can be used with the same housing as standard bearings. In creep limit load tests, the more housing clearance is reduced, the greater the improvement in creep prevention, due to the tension of the O-ring mounted in the outer ring. 12 15 17 700 600 Creep-Free Bearing Conventional bearing (without O-ring) 500 20 400 300 25 200 100 0 0 5 10 15 20 25 30 35 40 30 Housing clearance (diameter), μm Fig. 1 Structure of Creep-Free Bearings Fig. 2 Creep limit load test (example: 6204) 35 2.Features and applications of Creep-Free Bearings 40 Features n Prevents creep 45 n Easy to assemble Assembly is easy since bearings can be fitted with a loose tolerance. n Reusable housing Very little abrasion occurs on the bore surface of the housing, making reuse possible. Bearings can be replaced since boundary dimensions are identical to standard bearings. No reworking of the housing is required. Fan motors Geared motors Creep-Free Bearings Sewing machines 1 G6 or H7 Contact seal type** Non-contact seal type ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV ZZ DDU VV 250 6202 6204 6208 350 300 250 200 150 100 50 0 0 10 20 30 40 Housing fit clearance (diameter), μm Fig. 3 Fit and insertion force 50 6202 6204 6208 200 150 100 50 0 0 10 20 30 40 50 Housing fit clearance (diameter), μm Fig. 4 Fit and sliding force lWhen oil or grease is applied to the outer diameter of the bearing, use a mineral oil or a synthetic hydrocarbon oil (NSK’s EA2, etc.). Note on mounting Creep-Free Bearings Washing machines 6000 6200 6300 6001 6201 6301 6002 6202 6302 6003 6203 6303 6004 6204 6304 6005 6205 6305 6006 6206 6306 6007 6207 6307 6008 6208 6308 6009 6209 6309 400 Pump motors Electric power tools 1 970 2 390 3 450 2 370 3 050 4 200 2 830 3 750 5 450 3 250 4 800 6 650 5 000 6 600 7 900 5 850 7 850 11 200 8 300 11 300 15 000 10 300 15 300 19 200 11 500 17 900 24 000 15 200 20 400 32 000 Shield type n No special machining of the housing is required Application examples Motors for general use 4 550 5 100 8 100 5 100 6 800 9 700 5 600 7 650 11 400 6 000 9 550 13 600 9 400 12 800 15 900 10 100 14 000 20 600 13 200 19 500 26 700 16 000 25 700 33 500 16 800 29 100 40 500 20 900 31 500 53 000 Bearing number * Although recommended fits are G6 or H7, G6 is recommended when used under conditions that prioritize insertion under light pre-load. **Low-contact seal available for seal type bearings. Contact NSK for details. Insertion force, N O-rings help prevent creep. 8 9 11 8 10 12 9 11 13 10 12 14 12 14 15 12 15 17 13 16 19 14 17 21 15 18 23 16 19 25 Cr (N) Recommended Basic number fits* C0r (N) (Open type) Sliding force, N O-rings 26 30 35 28 32 37 32 35 42 35 40 47 42 47 52 47 52 62 55 62 72 62 72 80 68 80 90 75 85 100 10 Basic load ratings lO-ring material is nitrile rubber (operating temperature range: –30 to 120°C) as a standard specification. Please contact NSK for use under special environments such as high temperatures. Chamfer angle 15–30° Chamfer dimension 0.01D mm Fig. 5 Housing shape and dimension Note on the product name “Creep-Free Bearings”: The term “free” should not be construed to mean that creep is nonexistent. 2 CAT. No.E1224a 2010 C-8 Printed in Japan ©NSK Ltd. 2007
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